As for the comment of the friend that it doesn't have enough space, let me mention that it is a backpack, not a school bag or a travel bag, and it is actually one of the larger bags, I would say.

Spaces:

1. Main compartment with the large zipper where it is divided into two sections, one for the 2-liter water blender and the other usually contains a 1.5-liter Coca-Cola (or tsipouro) bottle, plus a large thermos for coffee, and there is also space for other things comfortably (I have even fit a 4-liter gasoline can alone). Imagine placing 2 x 1.5-liter Coca-Cola bottles side by side.

2. The small external pocket with the phosphorescent zipper is quite large for keys, wallet, phone, and cigarettes. It also has a mesh pocket on the outside.

3. When we open the buttons on the right and left sides of the bag, another space is revealed with a fairly large zipper, there is a tool pouch that wraps and secures with Velcro. It can hold the basic tools that you carry with you.

4. There is also a space outside the bag. Between the main compartment and the small pocket, there is a gap along the length of the bag where there is an elastic cord. There, you can securely fasten another large bottle (I personally put extra gasoline there).

After 2 years of use, I have the following to say. It is high quality and durable, withstands bumps and a few falls. It tore once at the bottom near the armpit next to the point where the strap ends because I had tightened the waist strap too much, so it suffered from the jolts. It also has a strap where the main shoulder straps can be tied together.

I also have the small bag from the series, but it is too small for me. However, I prefer the way it is fastened in the center of the chest. For me, the ideal size would be the size of the small bag with the fastenings of the larger one.